Portable welding machine



FIG. 1 is a front elevation view of a portable welding machine showing our new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof.

FIG. 7 is a front perspective view thereof;

FIG. 8 is a front perspective view thereof;

FIG. 9 is a rear perspective view thereof; and,

FIG. 10 is a rear perspective view thereof.

The broken lines in the drawings depict unclaimed environmental subject matter. 

CLAIM The ornamental design for a portable welding machine, as shown and described. 